JP2939374B2 - 2-segment core AC rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-part iron core AC rotary electric machine in which a stator core is divided into two parts.

[0002]

2. Description of the Related Art In a three-phase AC rotating electric machine, in order to form a stator core into a two-part shape, it is necessary to form a single-layer stator winding. In this single-layer winding, since one stator winding is inserted in one stator slot, the number of windings is half of the number of stator slots, and one winding is provided in the slot. Since the wire is inserted, the space factor of the conductor can be made larger than that of the double-layer winding because there is no interlayer insulation.

[0003] On the other hand, the double- layer winding is a winding method in which two stator windings are inserted into one stator slot, and may be of one kind of winding shape. It is not suitable for a two-piece stator core because the winding does not break at the part. On the other hand, in the case of a single-layer winding, the number of poles is 2, 4, 8,
If the number of parallel circuits is selected to be 16 or 2 and the number of parallel circuits is set to 2 or 4, it is possible to completely divide the stator into two with respect to the split stator. However, other types of windings having different shapes are required to avoid intersection of the winding end portions. Particularly when used for a two-piece stator core, imbalance such as leakage reactance between the coil ends of the coil ends and between the phase bands occurs between the three-phase windings due to the shape of the winding end portions, and the three-phase winding An imbalance in line impedance occurs.

FIG. 6 shows a conventional two-piece iron core AC rotating electric machine.
FIG. 3 is a development view of a cross section in a direction orthogonal to an axial direction of a stator . FIG.
In the above, a coil 3 having an outer periphery provided with ground insulation 6 is inserted into a slot 2 formed in parallel with a two-piece stator 1, and a wedge 7 is inserted into an inner end thereof. Impregnated.

[0005]

[SUMMARY OF THE INVENTION] imbalance of impedance <br/> scan described above, in the multi-phase AC rotary electric machine, current, occurs unbalanced voltage power supply side, in particular multi-phase alternating current high capacity In the case of rotating electric machines, not only has a large effect on the power supply system, but in the case of electric motors, torque is a major factor that causes pulsation, and if used for driving rolling rolls in a rolling mill, the surface of the rolled material In some cases, scratches may occur. Accordingly, an object of the present invention is to provide a two-piece iron core AC rotating electric machine capable of reducing current and voltage imbalances caused by impedance imbalance and torque ripple.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a single-layer type mold.
In winding coil is incorporated into an open slot of the two-division type stator halving core AC rotary electric machine, type winding carp
Magnetic material or and open slots for adjusting section a spacer of a non-magnetic material is inserted to balance the phase reactance Le
Characterized by being provided on the bottom side .

[0007]

[Action] As is well known, the impedance of the polyphase AC rotary electric machine, the slot leakage permeance in the stator slots and rotor slots, Jikuzagu leakage permeance, the coil end leak permeance, such as the phase belts between leakage permeance size And the vector sum of the resistances determined by the armature winding resistance and the rotor winding resistance.

In the present invention, mainly, the stator slot leakage permeance can be adjusted.
That is, the slot leakage permeance can be calculated from the width and depth dimensions of the slot and the dimensions of the coil inserted into the slot. For this reason, when a magnetic material is inserted into the bottom of a slot that is deeper than usual, the slot is magnetically equivalent to a shallower slot depth. Then, the value of the slot leakage permeance in the slot in which the magnetic material is inserted at the bottom of the slot can be reduced. Also, if you insert a non-magnetic material into the bottom of a slot that is deeper than usual,
Magnetically, the slot depth is deeper than usual, and the value of the slot leakage permeance in the slot is still large.

Further, when the permeance of the slot leakage between the case where only the magnetic material is inserted into the bottom of the slot and the case where only the non-magnetic material is inserted is set to the minimum and maximum, respectively, the combination of the magnetic material and the non-magnetic material , The slot leakage permeance can be adjusted between minimum and maximum value,
With such a combination of the slot groups, the amount of slot leakage permeance is adjusted for each phase. In the present invention, the slot depth of the stator core is set to a slot deeper than usual,
At the bottom, only a magnetic material is inserted, a combination of a magnetic material and a non-magnetic material, or only a non-magnetic material is inserted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Stator core 1 for two-part iron core AC rotating electric machine
Slots for receiving armature windings formed in
2 is made deeper shape than usual as shown in FIG. 1,
Into the slot 2, a magnetic material 8 is inserted into the insulated coil 3, the wedge 7 and the slot bottom, or a combination of the magnetic material 8 and the non-magnetic material 9 or only the non-magnetic material 9
Is inserted.

In this embodiment, the slot 2 is
The magnetic body 8 has a parallel slot shape, and the magnetic body 8 has a strip shape as shown in FIG. 2, and is formed by mixing a magnetic material such as iron powder and a non-magnetic non-conductive adhesive such as an epoxy resin. The non-magnetic material 9 is also a band-shaped non-conductive material, for example, a glass / polyester laminate as shown in FIG. The magnetic body 8 and the non-magnetic body 9 are in the shape of a strip, but may be inserted into the bottom of the slot in an integrated manner or in the form of a strip. After the slots of the magnetic material 8 and the non-magnetic material 9 are inserted, they are vacuum impregnated with epoxy resin together with the coil 3 as in the conventional case.

In the two-piece iron core AC rotary electric machine of the present invention, as described above, the slot 2 is made deep in advance, and the proportion of the slot leakage permeance in the permeance group constituting the reactance is increased. . After inserting the coil 3 and completing the connection, an AC voltage is applied,
The impedance of each phase and the resistance of each phase are measured, and the reactance of each phase is obtained from the two to calculate the value of the reactance imbalance. If the reactance imbalance amount is known before inserting the coil 3 into the slot 2, it is not necessary to insert the coil 3 and measure the impedance as described above. When the reactance imbalance amount is known, the slot leakage permeance can be reduced by the above-described operation by inserting the magnetic body 8, the magnetic body 8 and the non-magnetic body 9 or only the non-magnetic body 9 into the slot 2 of each phase. Adjustment can be performed for each phase.

According to the present invention, the proportion occupied by the slot leakage permeance is larger than that of the other permeance group of the reactance component, so that the influence on the entire reactance is large. It is possible to alleviate the unbalance such as the leakage reactance between the coil ends of the coil end portions and the inter-phase band leakage caused by the different coil end shape for each coil. This allows
Not only can the imbalance in voltage and current exerted on the power supply system be reduced, but also the torque ripple generated by the rotating electric machine can be reduced.

FIG. 4 shows another embodiment of a two-piece iron core AC rotary electric machine according to the present invention. The structure is almost the same as that of FIG.
The material of the magnetic body 18 inserted into the slot bottom is different. The wood <br/> fees, permeability is high, high metal plates saturation magnetic flux density, for example, a steel plate. The material of the non-magnetic material 19 is the same as in FIG.

In this case, since the magnetic permeability is higher than that of the magnetic material shown in FIG. 2, it is equivalent to a shallow slot.
The value of the slot leakage permeance can be made smaller, and the adjustment width of the reactance imbalance can be made wider than in FIG. In this case, it is possible to alleviate the unbalance of the rotating electric machine having a large reactance unbalance, and not only the voltage and current imbalance applied to the power supply system is reduced, but also the torque ripple generated by the rotating electric machine is reduced. Can be reduced.

The magnetic material inserted into the bottom of the slot is
The magnetic material shown in FIG. 2, for example, iron powder and a non-magnetic, non-conductive adhesive, for example, a strip formed by mixing an epoxy resin, and the strip shown in this embodiment having high magnetic permeability and saturation. It may be combined with a metal plate having a high magnetic flux density, for example, an iron plate.

FIG. 5 shows another embodiment of a two-piece iron core AC rotary electric machine according to the present invention. In FIG. 5, the stator slot includes a portion for accommodating the coil 3 and the wedge 7, and a slot 11 for inserting a material for adjusting slot leakage permeance.
It consists of: In this case, the thickness 13 of the chip 12 and the dimensions of the opening 14 at the boundary between the portion for accommodating the coil 3 and the wedge 7 and the slot 11 for inserting the material for adjusting the slot leakage permeance are shown in FIGS. It is possible to obtain a value larger than the slot leakage permeance determined by the slot shape shown by. Thereby, the maximum value of permeance can be expanded, and the adjustment width of the reactance imbalance can be made wider than in FIGS. Further, by separating the slot for accommodating the coil 3 and the wedge 7 and the slot 11 for inserting the material for adjusting the slot leakage permeance, it is necessary to insert the non-magnetic material 19 at the bottom of the slot for the phase that increases the leakage. There is no.

Magnetic body 18, Magnetic body 18 and Non-magnetic body 19
Is inserted into the slot 11 for adjusting the slot leakage permeance as described with reference to FIGS. Also in this case, the imbalance of the rotating electric machine having a larger reactance imbalance can be reduced, and the imbalance of the voltage and current applied to the power supply system is reduced.

[0019]

As described above, according to the present invention, a single-layer winding mold is provided.
In the two segment core AC rotary electric machine can coil is incorporated into an open slot of the two-division type stator type wound coil
An adjustment portion for the spacer to insert the respective phases of magnetic material reactance balancing or and the non-magnetic material of the open slot
By providing the coil on the bottom side, the unbalance of the reactance of each coil is adjusted, so that it is possible to obtain a two-piece iron core AC rotating electric machine capable of reducing unbalance of voltage and current and pulsation of torque.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of a two-piece iron core AC rotating electric machine according to the present invention.

FIG. 2 is a perspective view showing a magnetic spacer inserted into a slot of the two-piece iron core AC rotating electric machine of the present invention.

FIG. 3 is a perspective view showing a nonmagnetic spacer inserted into a slot of the two-piece iron core AC rotating electric machine according to the present invention;

FIG. 4 is a partial sectional view showing another embodiment of the two-piece iron core AC rotating electric machine of the present invention.

FIG. 5 is a partial cross-sectional view showing another embodiment of a two-piece iron core AC rotary electric machine according to the present invention.

FIG. 6 is a partial cross-sectional view showing an example of a conventional two-piece iron core AC rotating electric machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Two-piece stator, 2 ... Slot, 3 ... Coil, 4 ...
Magnetic material as a spacer, 5 ... non-magnetic material as a spacer, 6 ... ground insulation, 7 ... wedge.

Claims (1)

(57) [Claims] 1. A two- piece iron core AC rotary electric machine in which a single-layer wound coil is incorporated in an open slot of a two- piece stator.
Interpolation spacers magnetic material or and the non-magnetic material to balance the scan
A two- piece iron core alternating-current rotary electric machine , wherein an adjusting portion to be inserted is provided on the bottom side of the open slot .